Mixing-valve.



' ,.W. A. SPEAKMAN.

MIXING VALVE. l AP PL IGATION FILED MAY 1'1, 1 914. 1,121,879. Patented Dee.' 22', 1914;`

l "2 SHEETS-sum1.

I t l i ally/70),; iwmwlliih ,F5 X y m INVENTOR W. SPEAK-MAIN.

MIXING VALVE. f APPLICATION FILED MAY 11, wu.

' Patented Deo. 22, 19.14.

@VILLARD A. BEEAKIAN, Gl? VVILlaIINGH'DN, DLAWRE.

gremio.

ieee.

Ermetismo@ Elec. 2.,

. Application ii, im. 'germi im. ermee.. 4

.To all whom it may concern;

Be it known that I, WILLAm) A. Ser-sw MAN, a citizen o1 the'United Stetes ofi/luier ica, residing in Wilmingtomin the eouitjy" of New Castle, in the State of Delaware',

have inveuteflceitaii new and useful' im# proveniente in Mixing-Valves, of which the following is a true und' exact description,

reference being .had to the accompanying drawings, iwhich form :i part thereof. x

My' present invention consists in an urlproved valve for imxmg two fluids, and is primarily devised for t vuliug'a simple, eilective and relatively ml expensive both or lavatory valve for mixing hot rend cold water so as to deliver e mixture at a desired'temperature. Y

More particularly, zug/invention consists in an improved valve for the purpose specified, of the kind ira which two inlet cham-- bers, one for hot :mel the other for cold wor. Y

` ter, are connected to e common outlet chemM ber by separate passa-ges or ports m eacliof which is located e corresponding plunger, the two `pluugers being connected amd mow -v ingitogetlier as the' valve is aaijusted.

Consitierecl from this as ect m invention has'or itsooject to lso form ,the piling/ers that the ratio or the hot'and colti Water flow ing'may be vitried in e gradual enlimiforiii manner, ae the piangere are moved'back :md

forth between one position in which only coll Water loivs through the valve and an'- v.other position in which only hot LWater passes through the valve. To accomplish this, form the giungere each Witho lcylindrioel' out' 0 portion fitting snugly in the `passage or' port to which the plunger pertins, andtermiuating at one-end in a. heliculv out oi'erlge; lilith this arrangement, es the flow .past either-'plunger varies between its rooximuni ziti'clmmimum limits, the orice-'b'elween the out of? .edge of the plunger and the Wall' of the passage in which the plunger' works, changes in'size' but remains of the same eliape,a triangle when the, pe-

ripheral eurface the plungerisdeveloped. In consequencefi'the discharge through theforifiee isl praotizolly4 proportional to its area, and varies uniformly with the movement of the plunger' from 'one end to the.

other of its thrott-ling stroke. f 2 Y My improvedvval-'e also comprises provisions preventing'theY assc'rribl of the valve partsfwitli th'tro flow contro ingv lmgers 'iiiteclihiilgedi so that the plunger designed.`

el purpose' of pro-Y to control the vflow of the @oid water ec tuellf; controls the How of hot Water, and the het Water plunger controls the How 'of .the Sold, Water.

'lllie Various features of noveltyl chere@ terizmg 'my invention are pointed out With partieularity in the claims annexed to eed forming e, part of this speciczition. For e better understanding of theinventiou, lilou'.n ever, find ci theA advantages possesse'othy it, reference should be had to the accompanying' drawings and descriptive' matter m which l here illustrated-oud described yisi f preferred form in which my iwe'ntion mit?? be embodied..

0f the drawings: vFigure 1 is e sectional elevation of o voli/crier supplying? o. mi ture of hot und Coldwater for beth or lavotory purposes; Fig. 2 is a, somewhat i; agrummz-.tic representation, showingthe relative arrangement of the plungers and the passages in which theyivorkwheum valve is iu its fully cloeed'. position; Fide. 3, e, 5, 6 and 7 ore views teken similarly to' Fig. 2, illustrating the changes lin the oon- *dition of the parte as the plungers are pro gressii'ely shifted 'from the closed position shown in Fig. 2v intothe position in which' the maximum flow of'hot water may occur;-

Fig. 8 is .an inverted plan with the casing in' section on the line 8-8 of Fig; 1, and with the flow controlling piangere removed from Eeledaoo casing A is formed with. two oppositely-die; l A

osed inlet chambers A and A2. The cham'' er A is intended to receive ,coldl *Water andthe chamber A hot water; The chambers A and A2 ere connected by arallel cylindricall passages, formed ree ectrvlely in the buliigigs or vii-ive seat' mem ers B andy through each ofthe bushings Bferid b 'is controlled by e corresponding plunger' 1D or d. :These piangere are efoched tof e.

b, to e common outlet chamber A, from -whichf`lea'cls the outlet port A4. The How crosshead C, by means of the lt readed plum ger extensions JD and g d2 respectively, which are ,v screwed` :into corre ending threaded" so'eketsgigfxtlieuiemlder The; crosslieaul G comprises a 'portion formed ideama smaller in diameter than the other extension d5 and the crosshead socket in which the latter ts; and I make the thread on the extension D:5 finer in pitch than the thread on the extension d". In addition, I provide means, as the rib C2 onthe 'crosshead C and the coperating slot A in the bonnet A, to insure that the erosshead and bonnet A are always assembled in a lxed angular adjustment; and to insure the same result with respect to the casing body A and the bonnet A5, I form the one with a lug Aand the other with a corresponding notch or recess A8. As shown, the casing body A and bon net A5 are detachably secured together by the' nut E. 1With the simple provisions just described it is impossible to assemble the valve parts with the plungers D and d working in the wrong ports.- At the same time the Yvalve may be readily taken apart and reassembled as to permit rewashering; e.` the replacement of the disks D4 and d'4. While in accordance with the provision of the statutes, lv haveillustrated and described the best form of my invention now known to 1ne,'it will be apparent to those skilled in the art that changes may be made in the form' ot' yapparatus disclosed without departing from the spirit ol' my invention, and that under some conditions certain features of my invention may be used without a corresponding use otl other features.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

l. In a mixing valve, the combination with a valve casing having two inlet chambers and an outlet chamber and having the outlet. chamber connected to each inlet chamber'by a corresponding passage, of a pair of plungersone mounted in each of said passages and each formed with a cylindrical out o' portion terminating in'a cut od edge slightly linclined to the adjacent end edge of the wall of the passage in which the plunger works, and means for simultaneously moving said plungers axially in said passages, the parts being so relatively arranged that, as the plungers are axially adjusted in said passages, the two orifices, one between each of said cut ofi edges and the adjacent end edge of the wall of the said passage in which the -plunger works, will vary inversely in area while each remains of the same triangular shape.

i2.v In a mixing valve, the combination with a valve casing having two inlet chambers and an outlet chamber and having the outlet chamber connected to each inlet chamber by a corresponding passage, of a pair of plungers one mounted in each of said passages and each formed with a cylindrical cut oil" portion terminating in a helical edge making one turn about the axis of the plunger, and means for simultaneously; moving said plungers axially in said passages, the parts being so relatively arranged that, as the plungers are axially adjusted in said passages, the two orificles, one between each of said cut o' edges and the adjacent end edge of the wall of the passage in which the plunger works, will vary inversely inarea while each remains of the'same triangular shape.

WILLARD A. SPEKMAN. 

